1. 專案測試時有測試ip，之後給分配公網ip.那麼怎麼獲取公網ip呢
2. 通過一個網路代理去獲取對應的資訊，返回的是一個Json，需要建立一個類接收，之後在取出來
3. 程式碼

接收的類

import java.io.Serializable;

public class IpMessage implements Serializable{
    private String ip;
    private String address;

    public IpMessage() {
    }

    public IpMessage(String ip, String address) {
        this
 
.ip = ip;
        this.address = address;
    }

    public String getIp() {
        return ip;
    }

    public void setIp(String ip) {
        this.ip = ip;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }
}
 

對應的介面

public interface GetIPAddressService {
    String getNetIp();
}

對應的實現類

@Service
@Transactional(rollbackFor = Exception.class)
public class GetIPAddressServiceImpl implements GetIPAddressService {
    public static String getRemoteIp() {
        InputStream in = null;
        StringBuffer buffer = new
 
 StringBuffer();
        try {
            URL url = new URL("http://ip.chinaz.com/getip.aspx"); //建立 URL
            in = url.openStream(); // 開啟到這個URL的流
            BufferedReader reader = new BufferedReader(new InputStreamReader(in,"UTF-8"));
            String inputLine = "";
            while ((inputLine = reader.readLine()) != null)
            {
                buffer.append(inputLine);
            }
        }catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                in.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return buffer.toString();
    }


    @Override
    public String getNetIp() {
        JsonTool JsonTool = new JsonTool();
        IpMessage ipMessage = JsonTool.toBean(IpMessage.class,getRemoteIp());
        return  ipMessage.getIp();
    }
}

呼叫getNetIp()方法就可以得到對應的ip。